Add 3+ layer parent/child relationships of tags to the tag library, and make them searchable based on parent/child status as well as by tag.
Use case:
Parent tag #Training
Child1 tag #StaffDevelopment
Child2 tag #RequiredCEUs
Child2 tag #TeamBuilding
Child1 tag #VolunteerEd
Child2 tag #Orientation
Child2 tag #SkillWorkshop
Child3 tag #SurveyAdmin
Child3 tag #FocusGroupMgmt
And so on. A search on the tag "Training" would deliver not only everything explicitly tagged "#Training" but all the child tagged-items; a search on #SkillWorkshop would deliver that plus its two child tags, and a search on "RequiredCEUs" would deliver only items with that specific tag.
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@Cecile - can you expand on this use case and provide another example?